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Note 18 - Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended						12 Months Ended
	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
U.S. federal income tax rate, amount							$ (3)	$ 36	$ 103
U.S. federal income tax rate, percent							21.00%	21.00%	21.00%
State & local income taxes, net of federal benefit, amount							$ 6	$ (1)	$ 6
State & local income taxes, net of federal benefit, percent							(46.00%)	(1.00%)	1.00%
Non-US income / expense, amount							$ (5)	$ 25	$ 23
Non-US income / expense, percent							39.00%	15.00%	5.00%
Credits & tax incentives, amount							$ (55)	$ (62)	$ (87)
Credits & tax incentives, percent							423.00%	(37.00%)	(18.00%)
US foreign derived intangible income, amount							$ (24)	$ (4)
US foreign derived intangible income, percent							185.00%	(2.00%)
US tax & withholding tax on non-US earnings, amount							$ 20	$ 21	$ 14
US tax & withholding tax on non-US earnings, percent							(154.00%)	12.00%	3.00%
Intercompany sale of certain operating assets, amount							$ 27		$ 5
Intercompany sale of certain operating assets, percent							(207.00%)		1.00%
Settlement and return adjustments, amount							$ 3	$ (19)	$ 29
Settlement and return adjustments, percent							(23.00%)	(11.00%)	6.00%
Enacted change in tax rates, amount							$ (2)	$ 3	$ 6
Enacted change in tax rates, percent							15.00%	2.00%	1.00%
Pension settlement, amount								$ 73
Pension settlement, percent								43.00%
Mexican non-deductible cost of goods sold							$ 17
Mexican non-deductible cost of goods sold, percent							(130.00%)
Goodwill impairment, amount							$ 8
Goodwill impairment, percent							(61.00%)
Miscellaneous items, amount	$ (14)	$ 56	$ (34)	$ (22)	$ (87)	$ (16)	$ 6	$ (2)	$ 1
Miscellaneous items, percent							(46.00%)	(1.00%)	0.00%
Valuation allowance adjustments, amount							$ 60	$ (102)	$ (22)
Valuation allowance adjustments, percent							(462.00%)	(60.00%)	(4.00%)
Total expense (benefit)							$ 58	$ (32)	$ 78
Effective income tax rate, percent							(446.00%)	(19.00%)	16.00%